Question: What chemical compound is considered a Class IB flammable liquid and has a maximum peak exposure limit?
Paraphrase: What chemical compound is considered a Lesson IB combustible fluid and includes a greatest top introduction limit?
SPARQL (Wikidata): select ?ent where { ?ent wdt:P31 wd:Q21009055 . ?ent wdt:P2406 ?obj . ?ent wdt:P31 wd:Q11173} ORDER BY ASC(?obj)LIMIT 5 
Answer: 1,2-dichloroethane